No SentinelOne antivirus installed

Oct 13, 2025 by talynt.org 66 views

[Bug]: Failed to Initialize the add-in

✈ Pre-Flight checks

Before we dive into the issue, let's make sure we've covered all the necessary steps to troubleshoot the problem.

No SentinelOne antivirus installed: If you have SentinelOne installed on your system, it's essential to ensure that it's not interfering with the PyRevit installation. If you're unsure, please refer to the solution provided above.
Searched in the issues: We've searched through the open and closed issues, but we couldn't find a similar problem. If you've also searched through the issues, please confirm that you've done so.
Searched in the pyRevit Forum: We've also searched through the pyRevit Forum to see if anyone else has encountered a similar issue. If you've done the same, please confirm that you've searched through the forum.
Followed the installation troubleshooting guide: We've thoroughly followed the installation troubleshooting guide to ensure that we've covered all the necessary steps to resolve the issue.
Using the latest pyRevit Version: We're using the latest version of pyRevit, which is 5.0.1.

🐞 Describe the bug

We had PyRevit installed when Revit 2023 was released, and it was working fine. However, when we updated to the latest version 5.0.1 to support Revit 2025, we encountered an error. The error message states that the assembly "pyRevitLoader.dll" does not exist. We've checked the file location, but we couldn't find the file extension.

We've also checked through previous versions to see if the file existed, but it's not present. We've used the command line to check if PyRevit was installed, and it appears that it did install.

The firm we work with uses SentinelOne, but we've established the necessary steps to allow PyRevit to run on our system. We're unsure if updating requires us to go through those steps again.

⌨ Error/Debug Message

Failed to Initialize the add-in "PyRevitLoader" because the assembly "C:\ProgramFile\pyrevit-Master\bin\n...\pyRevitLoade.dll" does not exist

♻️ To Reproduce

Unfortunately, we're unable to reproduce the issue as it's specific to our system configuration.

⏲️ Expected behavior

We expect the PyRevit add-in to initialize successfully without any errors.

🖥️ Hardware and Software Setup (please complete the following information)

Microsoft Windows [Version 10.0.22631.4890]
(c) Microsoft Corporation. All rights reserved.

U:\>pyrevit env
==> Registered Clones (full git repos)
==> Registered Clones (deployed from archive/image)
master | Deploy: "basepublic" | Branch: "master" | Version: "4.8.12.22247+0031" | Path: "C:\Program Files\pyRevit-Master"
==> Attachments
master | Product: "Autodesk Revit 2025" | Engine: ? | Path: "C:\Program Files\pyRevit-Master"
master | Product: "Autodesk Revit 2024" | Engine: ? | Path: "C:\Program Files\pyRevit-Master"
master | Product: "Autodesk Revit 2023" | Engine: ? | Path: "C:\Program Files\pyRevit-Master"
master | Product: "Autodesk Revit 2022" | Engine: ? | Path: "C:\Program Files\pyRevit-Master"
master | Product: "Autodesk Revit 2021" | Engine: ? | Path: "C:\Program Files\pyRevit-Master"
2020.2.1 (New Install) | Version: 20.2.12.1 | Build: 20200210_1400(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2020\"
2019.2 (Full Install) | Version: 19.2.1.1 | Build: 20190108_1515(x64) | Language: 1033 | Path: "C:\Program Files\Autodesk\Revit 2019\"
==> Running Revit Instances
Error: Object reference not set to an instance of an object.
Run with "--debug" option to see debug messages

Additional context

We've attached two images that may provide additional context to the issue.

Possible Solutions

Based on the information provided, here are a few possible solutions to the issue:

Reinstall PyRevit: We can try reinstalling PyRevit to see if that resolves the issue.
Check for conflicts with SentinelOne: We can check if there are any conflicts with SentinelOne that may be causing the issue.
Update to the latest version of pyRevit: We can try updating to the latest version of pyRevit to see if that resolves the issue.
Check the file location: We can check the file location to ensure that the assembly "pyRevitLoader.dll" exists.

Conclusion

In conclusion, we've encountered an issue with the PyRevit add-in failing to initialize due to the assembly "pyRevitLoader.dll" not existing. We've checked the file location, but it's not present. We've also searched through the issues and the pyRevit Forum, but we couldn't find a similar problem. We're unsure if updating requires us to go through the necessary steps to allow PyRevit to run on our system again. We've attached two images that may provide additional context to the issue. We're open to any suggestions or solutions that may help resolve the issue.
[Bug]: Failed to Initialize the add-in - Q&A

Q: What is the issue with the PyRevit add-in?

A: The issue is that the assembly "pyRevitLoader.dll" does not exist, causing the add-in to fail to initialize.

Q: What are the possible causes of this issue?

A: The possible causes of this issue are:

Reinstallation of PyRevit: If PyRevit was reinstalled, it may have removed the assembly "pyRevitLoader.dll".
Conflicts with SentinelOne: If there are conflicts with SentinelOne, it may be interfering with the PyRevit installation.
Update to the latest version of pyRevit: If the latest version of pyRevit was installed, it may have removed the assembly "pyRevitLoader.dll".
File location issue: If the file location is incorrect, the assembly "pyRevitLoader.dll" may not be present.

Q: How can I resolve this issue?

A: To resolve this issue, you can try the following:

Reinstall PyRevit: Try reinstalling PyRevit to see if that resolves the issue.
Check for conflicts with SentinelOne: Check if there are any conflicts with SentinelOne that may be causing the issue.
Update to the latest version of pyRevit: Try updating to the latest version of pyRevit to see if that resolves the issue.
Check the file location: Check the file location to ensure that the assembly "pyRevitLoader.dll" exists.

Q: What are the system requirements for PyRevit?

A: The system requirements for PyRevit are:

Windows 10: PyRevit requires Windows 10 to run.
Autodesk Revit: PyRevit requires Autodesk Revit to run.
Python: PyRevit requires Python to run.
SentinelOne: PyRevit requires SentinelOne to run.

Q: How can I troubleshoot this issue?

A: To troubleshoot this issue, you can try the following:

Check the error message: Check the error message to see if it provides any clues about the issue.
Check the file location: Check the file location to ensure that the assembly "pyRevitLoader.dll" exists.
Check for conflicts with SentinelOne: Check if there are any conflicts with SentinelOne that may be causing the issue.
Update to the latest version of pyRevit: Try updating to the latest version of pyRevit to see if that resolves the issue.

Q: What are the benefits of using PyRevit?

A: The benefits of using PyRevit are:

Improved productivity: PyRevit can improve productivity by automating tasks and providing a more efficient workflow.
Increased accuracy: PyRevit can increase accuracy by reducing the risk of human error.
Enhanced collaboration: PyRevit can enhance collaboration by providing a shared platform for team members to work on projects.
Cost savings: PyRevit can provide cost savings by reducing the need for manual labor and improving the efficiency of the workflow.

Q: How can I get support for PyRevit?

A: To get support for PyRevit, you can try the following:

Contact the PyRevit team: Contact the PyRevit team directly to get support.
Check the PyRevit documentation: Check the PyRevit documentation to see if it provides any answers to your questions.
Join the PyRevit community: Join the PyRevit community to connect with other users and get support.
Check the PyRevit forum: Check the PyRevit forum to see if anyone else has encountered a similar issue.